Heating unit



FA LEONI HEATING UNIT Feb. 1K4, 1939.

Filed Feb, 25, 1957 E Sheets-Sheet l ATTORNEY Feb. 14, 1939. P, LEON| Il2,147,046

HEATING UNIT Filed Feb. 25, 1937 2 Sheets-Sheet 2 ATTORNEY Patented Feb.14, 1939 l PATENT lori-"Ici:

'- HEATING UNrr Pilade Leoni, Providence, R. I., Iassignor toLemurflncorporated, Providence, R. I., `arcorvpof ration of Rhode IslandApplication YFebruary 25, 1937, Serial No. 127,625

f 2 claims.

This is a new yand 'useful improvement relatingv to a mechanical andphysical arrangement for the better recovery of the'heat generatedthrough the combus'ion of fuel for the purpose of `heating water orother liquid medium to generate steam, or for other uses to which 'thisimprovement may adapt itself.

The chief object of my improvement makes for a' greater elimination ofheat losses in the process of heat transfer to a medium to be heated.The semi-flash production of steam in a boiler is another object. Afurther object of this improvement is the application of the heatgeneratedthrough the combustion of fuel, rst to the upper levels of theliquid medium to be heated and then successively to the subsequent lowerstrata of said liquid medium,

Other advantages and other objects of my improvement may be moreapparent from consideration of the details described and claimed.

With references to the drawings,

Figure l is a vertical section of the boiler taken along line C-C ofFigure 2, and showing a part of the lower casing broken away.

Figure 2 is an end View of the upper part of the boiler section takenalong line B-B of Figure 1, and shows the arrangement of heat conduits20 and 2I. Y

Figure 3 is a vertical section of Figure 2 taken along line A-A ofFigure 2 and shows the arrangement of the heat passages or conduits oneach side of the combustion chamber.

Figure 4 is a general view of the assembled sections of the boiler withthe gas burners rings 28 and 29 in position at the inlet 6 of thecombustion chamber 5.

Referring to the drawings in detail, Figure 1 shows in section the threeparts composing the boiler. The first section being the steam dome Iformed by outer shell 2 and being equipped with steam port I'I, gaugeport I4a, safety valve port I6, and a flange 3. Flange 3 is bolted tothe next lower section of the boiler by bolts II,

The second section of the boiler is formed by an outer shell 4, acombustion chamber 5 enclosed within said shell 4, and having its inlet6 to the atmosphere, and outlets 'I and'la, to which are connected heatpassages or conduits 2D and 2|. The outer shell 4 is equipped with upperflange 8 and lower iiange 9 which are bolted to the adjoining anges ofthe upper and lower section of the boiler by bolts I I and I la. l

The third section of the boiler is formed by outer shell I2 and theinner 4shell I9. Inner shell I9 is closed at the top and opened at thebottom,`an1d the lower edge of the outside shell I2, and inner shell I9are bonded together to form the bottom of an. annular tank I8 intowhich, in subsequent lower circular layers, are placed heat passages orconduits 20 and 2I which iill the intervening space between tank I9 andtank I2 to the extent needed to leave only room enough for a film ofwater to rise on all sides of said heat conduits. Said heat passages orconduits have their upper ends. connected to the outlets.

l and "Ia of the combustion chamber '5, and have their lower endsprotruding at the bottom of shell I2 and connected to the inlet 22 of asuction device 24 placed near the bottom outside of the boiler. Outlet25 of suction device 24 discharges into a stack not shown, and isequipped with a drain 26. The annular tank I8 is provided with ports I4for gauge andV other attachments, port I3 for the return of thecondensed steam into said tank, and port I5 for the feed of liquid tosaid tank.

The liquid to be heated, as contained by said boiler unit, is keptwithin the boiler at such level as to barelysubmerge the combustionchamber and the heating conduits.

The combustion chamber 5 and the heat passages or conduits 2|] and 2| llas much of the space which is surrounded by shell 4 as it is possible,but leaving just enough of it to allow a continuous film of water torise to the surface so as to replace the water evaporated in makingsteam, and so as to maintain constant the level of the water in thebolier The operation of the boiler thus far described is as follows:

The boiler is lled with the liquid to be heated up to a level sufficientmerely to submerge the combustion chamber 5 and heat passages or con'duits 20 and 2|. Suction device 24 is then put into operation andcreates a vacuum inside the heat passages or conduits 20 and 2I andcombustion chamber 5. Fuel is now admitted through inlet 6 intocombustion chamber 5 and there combusted. The heat thus generatedtogether with the products of the combustion are then car- .ried awaythrough outlets 'I and 'Ia of the combustion chamber 5 into and throughthe heat passages or conduits 20 and 2| to the suction device 24 andthen through its outlet 25 into the stack not shown.

Inasmuch as the combustion chamber 5 and the upper portions or heatpassages or conduits 2|! and 2 I are immersed just below the very topsurface of the liquid to be heated, it follows that the most intenseheat generated through the combustion of fuel, is in direct contact,rst, with the top levels of the liquid, and successively with thesubsequent lower levels of said liquid. 'I'his eiects the most promptand eflicient transfer of heat to the liquid surrounding the combustionchamber 5 and the heat passages or conduits 20 and 2|, because thetemperature of the liquid and the temperature of the above mentionedpar-ts are divergent, that is: the heat, on its travels'from thecombustion chamber through and along the heat conduits 20 and 2| to thelower levels of the liquid, always meets subsequent lower temperaturesof said liquid.

Having thus described the nature and objects of my improvement and apreferred embodiment of the same, which embodiment is to be taken asillustrative rather than limitative, what I desire to secure by LettersPatent is:

1. A boiler unit comprising, in combination, a top section, a,mid-section and a lower section; all said sections being connected forwater flow Yfrom the lower section to the top section; the

top section including a steam'chamber; the midsection enclosing withinits walls 'a combustion chamber having its outlet connected to conduitscoiled partly within the said mid-section and partly within the saidlower section; and the lower section being composed of an inner circularshell closed at the top and of a larger outer circular shell the loweredge of which is bonded with the lower edge of the smaller shell to forman annular tank into which the said heat conduits descending from thecombustion chamber in the midsection are coiled into successively lowerlayers, said heat conduits having their lower ends passing through thewall of the lower part of the outer shell.

2. A boiler unit comprising, in combination, a top section, amid-section and a lower section; all said sections being connected forwater flow from the lower section to the top section; the top sectionincluding a steam chamber; the mid-section enclosing within its Walls acombustion chamber having its outlet connected to conduits coiled partlywithin the said mid-section and partly within the said lower section;and the lower section being composed of an inner circular shell closedat the top and of a larger outer circular shell the lower edge of whichis bonded with the lower edge of the smaller shell to form an annulartank into which the said heat conduits descending from the combustionchamber in the mid-section are coiled into successively lower layers,said heat conduits having their lower ends passing through the wall ofthe lower part of the outer shell; the said heat conduits substantiallyfilling the sand tank whereby the flow of water from the lower sectionto the top section is so restricted as to substantially replace thewater converted into steam in the top section.

PILADE LEONI.

